Enhancement to pointInterpolator

[aprilnovak]

Would the following be accepted as a pull request?

We are using the pointInterpolator, and want to protect ourselves from cases where a user could accidentally call the interpolator out-of-bounds of the mesh. We do not want to rely on console output, which is the only place that Nek reports if any points were outside the mesh. I'd like to propose capturing the counts variable as an output so that we can use it in Cardinal.

Thanks!